• Country
• Canada

• Manufacturer / Brand
• NAD, New Acoustic Dimension; Ontario

• Year
• 1979–1982 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 129702

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 38

• Semiconductors
• BC546 BC549 BC556 BC559 2SC1400 BD139 2N6551 2N6554 MJ2955 2N3055 BD140 LB1405

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 117 or 220 or 240 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 40 W (56 W max.)

• Material
• Metal case

• from Radiomuseum.org
• Model: Stereo Amplifier 3020 Series 20 - NAD, New Acoustic Dimension;

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 420 x 96 x 240 mm / 16.5 x 3.8 x 9.4 inch

• Notes

• A 2 x 20 watt stereo hi-fi amplifier, the NAD 3020 Series 20 was the first in a series of 3020 Amplifiers which continued in production until 1993. With a high-voltage, high-current output stage enabling it to deliver twice its rated power to handle musical transients, and a 'soft clipping' circuit which gently limits the waveform voltage when the amplifier is driven beyond its rated power. It also has a sophisticated low noise near distortion free 6 transistor MM phono pre-amplifier.

  With RCA input sockets for Phono (MM), Tuner and Aux, input/output RCA sockets and DIN socket for Tape, and a Soft Clipping switch (On/Off). Sockets for Pre-amp out and Normal-in connected with removable U shaped metal jumpers, and sockets for Lab-in (an alternative to the Normal-in socket with wideband frequency response). Connectors for one pair of loudspeakers and two AC outlets (not all models).

  Rotary controls for Bass, Treble, Balance and Volume, push buttons for Power, input selection (Aux, Tuner, Phono, Tape), Audio Muting and Loudness. Power On pilot light and and 5 LED Power Meter indicators. Jack for headphones. Rack mount handles are an optional extra.

  Designed by Björn-Erik Edvardsen.

  Specification
  Continuous Average Power Output into 8Ω
  (Min. RMS power per channel, 20Hz - 20kHz, both channels driven
  with no more than the rated distortion) ......:  > 20 watts
  Rated Distortion 20Hz - 20kHz .................:  < 0.02%
  Clipping Headroom at 8Ω .........................:  +1.5dB
  Clipping Power at 8Ω / 4Ω / 2Ω ................:  28W (8Ω), 37W (4Ω), 42W (2Ω)
  Dynamic Headroom at 8Ω ........................:  +2.9dB
  Dynamic Power (Max. short term) .............:  39W (8Ω), 58W (4Ω), 72W (2Ω)
  Damping Factor at 50Hz, 8Ω ....................:  > 55
  Frequency Response Range .....................:  10Hz - 70kHz
  Frequency Response 20-20kHz Lab Input ..:  ±0.5dB
  Input Sensitivity .......................................:  2.5mV (MM), 150mV (line)

  Versions/Power Requirements
  117/220/240 V AC 50/60Hz internally switchable

  Note: The schematic mentions for the complementary power output stage the transistors 2N3055 and 2N2955. According to the data book Transistoren-Taschen-Tabelle, Franzis 1977, 2N2955 is a low power pnp-Ge-type. So 2N2955 is a misprint here, it should be a MJ2955 (pnp-Si, 150W, 15A).

  Made in Taiwan

  See also the later versions of the NAD 3020 Stereo Amplifiers :
  NAD 3020A, NAD 3020B, NAD 3020e, NAD 3020i

  ---

  Stereoverstärker von NAD (Toronto, Kanada). Die 3020-Serie wurde von 1979 bis 1993 gebaut (mehr als 1 Million Exemplare). Sehr gute Eingangsstufe für Plattenspieler mit elektromagnetischem Tonabnehmer. Verstärker pro Kanal: 2 × BC546, BC549, 2 × BC556, 4 × BC559, 2 × BD139, MJ2955, 2N3055, 2N6551, 2N6554, 2 × 2SC1400. Stabilisiertes Netzteil mit BC549, BC559, BD139, BD140. Ein IC, LB1405 für LED-Leistungsanzeige.  Entwurf von Björn-Erik Edvardsen.

• Net weight (2.2 lb = 1 kg)
• 5.3 kg / 11 lb 10.8 oz (11.674 lb)

• Mentioned in
• -- Original-techn. papers. (NAD 3020 Service Manual, NAD 3020 User Manual)

• Literature/Schematics (1)
• Gérard Chrétien: "Le NAD 3020: un remarquable compromis", L'Audiophile, No.18, 1980, pp.49-53

• Author
• Model page created by Aren van Waarde. See "Data change" for further contributors.

• Other Models

• Here you find 120 models, 118 with images and 24 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from NAD, New Acoustic Dimension; Ontario